What are the best practices for using collections in C#?
When using collections in C#, it's important to choose the right type for your needs. For example, use List<T> for ordered collections, Dictionary<TKey, TValue> for key-value pairs, and HashSet<T> for unique items.
Can you explain why I should use a HashSet instead of a List?
Certainly! A HashSet is optimized for fast lookups and ensures that all items are unique, making it ideal for scenarios where you need to check for duplicates or perform set operations.
What about performance considerations when using these collections?
Performance can vary significantly between collections. For instance, accessing an element in a List is O(1), while searching in a HashSet is also O(1) on average. However, inserting into a List can be O(n) if resizing is needed, while HashSet maintains O(1) for inserts.
Are there any specific methods I should avoid?
Yes, avoid using methods that modify the collection while iterating over it, as this can lead to exceptions. Instead, consider collecting items to remove in a separate list and then process them after the iteration.
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